TWI480604B - Light guide element - Google Patents

Description

Light guiding element

The present invention relates to a light guiding element, and more particularly to a light guiding plate which can effectively improve light use efficiency.

Referring to the first figure, it is a side view of a conventional light source module. The light source module 10 includes a light guide plate 12 and a light emitting element 14 . The light guide plate 12 includes a light incident surface 120, a light exit surface 122, a bottom surface 124 and a rear end surface 126. The light exit surface 122 is adjacent to the light incident surface 120. The bottom surface 124 is opposite to the light exit surface 122 and adjacent to the light incident surface 120. The end surface 126 is opposite to the light incident surface 120 and is adjacent to the light exit surface 122 and the bottom surface 124 at the same time. A patterned microstructure 128 is disposed on the light exit surface 122 and/or the bottom surface 124. In the first figure, the microstructures 128 are disposed on the light exit surface 122 of the light guide plate 12, and the microstructures 128 are used to extract light.

The light-emitting element 14 is disposed adjacent to the light-incident surface 120 and emits light toward the light-incident surface 120 to allow most of the light to enter the light guide plate 12. The light-emitting element 14 and the light guide plate 12 are combined to form a one-side light source module, whereby most of the light incident from the light-incident surface 12 toward the light-incident surface 120 passes through the light-emitting surface of the light guide plate 12 122 to the outside world.

The light entering the light guide plate 12 can be divided into three types according to different transmission modes: when the first type of light L1 contacts the light exit surface 122, part of the light is scattered or refracted directly through the light exit surface 122, and partially reflected back to the light guide plate. 12, the design of the microstructure 128 can The amount of light emitted is controlled; the second type of light L2 is generally designed to have total internal reflection on the bottom surface 124 to be transmitted inside the light guide plate 12, and the second type of light L2 is transmitted to the microstructure 128 of the light exit surface 122. In the first type of light L1, part of the light is scattered or refracted directly through the light exit surface 122, and partially reflected back to the light guide plate 12 until its energy is exhausted. The third type of light L3 is transmitted directionally toward the rear end surface 126 of the light guide plate 12, and forms the first type of light L1 or the second type of light L2 on the high beam side. The light distribution curve C1 of the light source module 10 corresponding to the viewing angle shown in the first figure is as shown in the second figure.

As seen from the second figure, since the third type of light L3 has high directivity, it has to undergo a long optical path to be converted into the aforementioned first type of light L1 at a position closer to the rear end surface 126 of the light guide plate 12. The second type of light L2 emits light, which means that the third type of light L3 has the most energy inside the light guide plate 12, but the light extraction efficiency is the worst, so that the light utilization efficiency of the light source module 10 is lowered. The light utilization efficiency of the light source module 10 refers to the ratio of the light incident from the light incident surface 120 to the light emitted from the light exit surface 122.

Although the design of the micro-structure of the optical surface 120 is also processed in the industry to increase the amount of light provided by the light source module 10 that the light guide plate 12 can receive, all of them focus on the light provided by the atomizing light source module 10 or uniformize. The light received by the smooth surface 120, that is, the amount of light that the light source module 10 enters the light incident surface 120. Under the above definition of light utilization efficiency, the ratio of the light incident on the light guide plate 12 from the light incident surface 120 to the light emitted from the light exit surface 122 is not improved. The design of the micro-structure processed into the optical surface 120 is also a pattern of repeated layout, which does not contribute to the special treatment of the third type of light L3.

In view of the prior art, one aspect of the present disclosure is to provide a light guiding element that can reduce light entering and transmitted to a rear end surface thereof. The amount of light destroys the directivity, so that most of the light can be diverged early and then emitted through the light exiting surface, thereby improving the light utilization efficiency of the light incident on the light guiding element.

An embodiment of the present invention provides a light guiding component, and the light guiding component cooperates with at least one light emitting component to form a light source module. The light emitting component has a light emitting region, and the light guiding component includes a light guiding body, and the light guiding body has an input. a light-emitting portion and a bottom surface, the light-incident portion has a light-incident surface and a groove, the light-incident surface is adjacent to the bottom surface, and the light-incident surface and the bottom surface cooperate to define a bottom edge, and the light-guiding body defines a first parallel with the bottom edge In the direction, the groove extends along the first direction, and the length of the groove in a second direction perpendicular to the first direction is between 1/10 and 1/3 of the length of the light emitting region in the second direction.

In other embodiments of the present technology, the angle of the groove can be designed to be 60 to 120 degrees to achieve a specific light-expanding effect. On the other hand, the structure of the groove can be a first surface and a second surface, and of course, a third surface can be extended. In other words, the groove and the light guiding body cooperate to define a The first surface and the second surface, the first surface is adjacent to the light incident surface, and the second surface is adjacent to the light incident surface and the first surface. For example, the first surface and the second surface may be designed as a plane in one embodiment, the first surface is obliquely adjacent to the light incident surface at an angle, and the second surface is obliquely connected to the light incident surface at another angle and the first surface. surface. In another embodiment, the first surface can be designed to be substantially perpendicular to the light incident surface, and the second surface is designed to be obliquely adjacent to the light incident surface and the first surface at an angle. In still another embodiment, the first surface may be designed to be substantially perpendicular to the light incident surface, and the second surface is designed to be adjacent to the light incident surface and the first surface in an arc shape. Of course, in other embodiments, the groove may have only a concave surface with a continuous distribution of curvature; or a first surface, a second surface and a third surface, and then three in cross section. The structure in which the line segments are connected.

From another perspective, in other embodiments of the technical aspect, the groove may be The plurality of pockets are arranged at intervals along the first direction, and may be composed of two or more slits which are arranged along the second direction and extend in parallel in the first direction.

Thereby, the groove of the foregoing embodiments has a length in the second direction which is between 1/10 and 1/3 of the length of the light emitting region in the second direction, which can beneficially damage the directional light provided by the light source module. The light type changes the light distribution curve of the light source module to improve the use efficiency of the third type of light L3.

10, 20, 50‧‧‧ Light source module

12, 22‧‧‧Light guide plate

120, 220, 320‧‧‧ into the glossy surface

122, 222, 342‧‧ ‧ light surface

124, 224‧‧‧ bottom

126, 226, 340‧‧ ‧ rear end face

128, 228, 346‧‧‧ microstructure

14, 24, 40‧‧‧Lighting elements

2200‧‧‧ convex

30, 30A, 30B, 30C, 30D, 30E, 30F‧‧‧ light guiding components

31, 31A, 31B, 31C, 31D, 31E, 31F‧‧‧ light guide body

32, 32D, 32E, 32F‧‧‧ into the light department

322, 322A, 322B, 322C, 322D, 322E, 322F, 323F‧‧‧ grooves

3220D, 3220F‧‧‧ nicks

3220E, 3222F‧‧‧ recess

324, 324A, 324B, 324C‧‧‧ first surface

326, 326A, 326B‧‧‧ second surface

33‧‧‧ bottom

330‧‧‧Bottom

C1, C2, C3, C4, C5, C6, C7, C8‧‧‧ light distribution curve

D1‧‧‧ first direction

D2‧‧‧ second direction

D3‧‧‧ third direction

L1‧‧‧First light

L2‧‧‧second light

L3‧‧‧3rd light

The first figure is a side view of a conventional light source module.

The second figure is a light distribution curve corresponding to the light source module shown in the first figure.

The third figure is a perspective view of a light guide plate according to a first embodiment of the disclosure.

The fourth figure is a side view of the light source module of the first embodiment of the disclosure.

The fifth figure is a light distribution curve corresponding to the light source module shown in the fourth figure.

6 to 11 are light distribution curves of the light source module according to the first embodiment of the present disclosure corresponding to grooves of different angles.

11 is a side view of a light guiding element according to a second embodiment of the present disclosure.

Fig. 12 is a side view of a light guiding element of a third embodiment of the present disclosure.

Figure 13 is a side view of a light guiding element according to a fourth embodiment of the present disclosure.

Fig. 14 is a perspective view of a light guiding element according to a fifth embodiment of the present disclosure.

Fig. 15 is a perspective view of a light guiding element according to a sixth embodiment of the present disclosure.

Fig. 16 is a perspective view of a light guiding element according to a seventh embodiment of the present disclosure.

Figure 17 is a side view of the light source module of the experimental example of the reverse teaching.

The eighteenth figure is a light distribution curve corresponding to the light source module shown in Fig. 17.

The above and other objects, features, and advantages of the present invention will be better understood from the following description and appended claims.

Referring to the third figure, a perspective view of a light guiding element according to a first embodiment of the present disclosure is shown. The light guiding element 30 is a plate-shaped body made of a transparent resin material or a transparent plastic such as polymethylmethacrylate (PMMA) or polystyrene (PS); the light guiding element 30 is used to guide the incident light. The direction of travel of the light within it is provided to provide a side light source.

The light guiding element 30 cooperates with a light emitting element 40 to form a light source module 50, as shown in the fourth figure. The light-emitting element 40 has a light-emitting area 400, which is a place where the light-emitting element 40 can emit light. In the embodiment, the light source module 50 is a side view light source module. Light-emitting element 40 can be, for example but not limited to, a side view light emitting diode (LED).

Please refer to the third and fourth figures at the same time. The light guiding member 30 has a light guiding body 31. The light guiding body 31 has a light incident portion 32 and a bottom surface 33. The light incident portion 32 has a light incident surface 320 and a recess 322. The light incident surface 320 is adjacent to the bottom surface 33. The light incident surface 320 and the bottom surface 33 cooperate to define a bottom edge 330. The light guiding body 31 defines a first direction D1 parallel to the bottom edge 330. The recess 322 is along the first direction D1. Extending, the length of the groove 322 in a second direction D2 perpendicular to the first direction D1 is longer than the length of the light-emitting region 400 in the second direction D2 1/10 to 1/3 of the degree. The light-emitting element 40 is disposed on the light-incident surface 320 and emits light toward the light-incident surface 320. It has been experimentally found that if the length of the groove 322 does not satisfy the limitation of 1/10 to 1/3 of the length of the light-emitting region 400, it is difficult to effectively unfold the light packet emitted from the light-emitting region 400, thereby forming a beneficial damage to the light pattern. Sexual interference.

In the present embodiment, the recess 322 is located at a central position of the light incident surface 320 in the second direction D2, and the open surface of the recess 322 is in a third direction D3 perpendicular to the first direction D1, and the length of the recess 322 is The light entering portion 32 is continuously formed. The light-emitting element 40 is disposed in front of the recess 322, and is not limited thereto. It should be noted that when the number of the light-emitting elements 40 is greater than one, the plurality of light-emitting elements 40 are arranged along the first direction D1, and the distance between the adjacent two light-emitting elements 40 is based on the light-emitting of each of the light-emitting elements 40. Adjusted for different strengths.

The groove 322 is matched with the light guiding body 31 to define a first surface 324 adjacent to the light incident surface 320 and a second surface 326 adjacent to the first surface 324 and the light incident surface 320, the first surface 324 and the second surface. The 326 are respectively planar and have an angle obliquely adjacent to the light incident surface 320, so that the recess 322 is V-shaped and has an included angle θ.

The light emitted from the light-emitting element 40 enters the light-guiding body 31 through the light-incident surface 320, the first surface 324, and the second surface 326. Since the first surface 324 and the second surface 326 are obliquely connected to the light-incident surface 320, respectively, Therefore, the direction of the light entering the light guiding body 31 through the first surface 324 and the second surface 326 is different from the direction of the light entering the light guiding body 31 through the light incident surface 320 (as shown in the fourth figure). It can beneficially destroy the directivity of the light type, so that most of the light entering the light guiding body 31 can be emitted through the light emitting surface 342, thereby improving the luminous efficiency of the light source module 50. The light-emitting surface 342 is opposite to the bottom surface 33 and adjacent to the light-incident surface 320 and the rear end surface 340.

Under normal circumstances, the light guiding body 31 has two opposite side faces 344, and each side surface 344 is adjacent to the light incident surface 320, the rear end surface 340, the light exit surface 342 and the bottom surface 33, respectively. The groove 322 is formed on the light guiding body 31 to have the same length as the length between the side faces 344. However, the present embodiment is not limited to the ratio of the groove 322 and the light-emitting region 400 in the second direction D2, and the parameter design of the groove 322 in the first direction D1 can be designed based on the present embodiment. It is taught that, as the light guiding body 31 of various shapes changes, for example, the opposite side faces 344 are expanded or retracted at an angle.

In order to achieve a uniform light-emitting effect of the light-guiding element 30, at least one of the light-emitting surface 342 and the bottom surface 33 is provided with a pattern-like microstructure 346. The microstructure 346 disposed on the light exit surface 342 is for scattering light, and the light is emitted outwardly through the light exit surface 342 (even if the light leaves the light guide body 31); the microstructure 346 disposed on the bottom surface 33 is used for reflection transmission to The light of the bottom surface 33 allows light to be transmitted to the light exit surface 342 and exits through the light exit surface 342 (even if the light leaves the light guide body 31). In the present embodiment, the microstructure 346 is exemplified by being disposed on the bottom surface 33. Secondly, in order to make the light intensity of the light emitted through the light-emitting surface 342 uniform, the layout area, the layout density and the layout depth of the microstructure 346 can be adjusted according to the light intensity that each microstructure can receive, for example (but not limited to) The layout area, layout density, and layout depth of structure 346 are inversely proportional to the intensity of the received light.

Refer to the fifth figure for the light distribution curve of the light source module corresponding to the fourth figure. The light distribution curve C2 shown in the fifth figure is measured by the viewing angle shown in the fourth figure; the light incident surface 320 is a 90-degree line attached to both sides of the coordinate axis 0 degrees, and the light-incident surface 320 is in the first The center point of the two directions D2 is aligned to the coordinate axis of 0 degrees. By comparing the second and fifth figures, it can be known that forming the recess 322 on the light guiding body 31 can effectively reduce the light intensity in the range of 10 degrees on both sides of the coordinate axis 0 degrees; secondly, on the light guiding body 31 Forming a groove 322 can increase the transmission angle of the light from 40 degrees on both sides of the coordinate axis shown in the second figure to about 45 degrees on both sides of the coordinate axis shown in the fifth figure. Therefore, the formation of the recess 322 in the light guiding body 31 can effectively reduce the amount of high directivity light transmitted to the rear end surface 340, and increase the amount of light transmitted to the light emitting surface 342 and the bottom surface 33, thereby achieving an effect of improving light use efficiency.

In addition, it is to be noted that the angle θ of the groove 322 affects the light pattern change, and the sixth to the tenth figures are the light distribution curves of the light source module corresponding to the groove of different angles according to the first embodiment of the disclosure.

The light distribution curve C3 shown in the sixth figure is a light distribution curve completed by the groove corresponding to the angle of 30 degrees. By comparing the second and sixth figures, it can be seen that although the groove 322 having the angle θ of 30 degrees effectively reduces the intensity of the light transmitted to the rear end surface 340, it also transmits to both sides of the coordinate axis at 0 degrees. The light intensity at the position of 20 to 30 degrees is greatly reduced, so that the light entering the light guiding body 31 is weak on the high beam side, and the low beam side is too strong, that is, the coordinate axis of the coordinate axis is clearly split, and the bright line of the near light source is easily generated. This results in uneven overall light intensity and is therefore limited to special applications.

The light distribution curve C4 shown in the seventh figure is a light distribution curve completed by the groove corresponding to the angle of 60 degrees. By comparing the second and seventh figures, it can be known that the groove 322 having an angle θ of 60 degrees effectively reduces the intensity of light in the range of about 15 degrees on both sides of the coordinate axis of 0 degrees, and reduces the amount of light transmitted to the rear end face 340. . The groove 322 with the angle θ of 60 degrees also allows the light transmission angle to reach about 43 degrees on both sides of the coordinate axis 0 degrees, so that the light of the coordinate axis 0 degrees is dispersed in the range of 15 to 43 degrees on both sides of the coordinate axis 0 degrees, so that More light touches the light surface 342 and the bottom surface 33 early, effectively improving light utilization efficiency, and is suitable for application to the small-sized light guide body 31.

The light distribution curve C5 shown in the eighth figure is a light distribution curve completed by the groove corresponding to the angle of 90 degrees. By comparing the second and eighth figures, it can be seen that the groove 322 having an angle θ of 90 degrees reduces the intensity of light transmitted to about 5 degrees on both sides of the coordinate axis, thereby reducing the amount of light transmitted to the rear end surface 340. . Since the ratio of the coordinate axis in the 0 degree direction is small, it is more suitable for the light guide body 31 of the medium size than the seventh figure. The groove 322 having an angle θ of 90 degrees effectively maintains the intensity of light in the range of 5 to 40 degrees on both sides of the coordinate axis, and allows the light transmission angle to reach about 43 degrees on both sides of the coordinate axis.

The light distribution curve C6 shown in the ninth figure is a light distribution curve performed by the groove corresponding to the angle of 120 degrees. By comparing the second and ninth figures, it can be seen that the groove 322 having an angle θ of 120 degrees can reduce the intensity of light transmitted to the range of 15 to 40 degrees on both sides of the coordinate axis at 0 degrees. Secondly, the intensity of the light in the range of 0 to 15 degrees on both sides of the coordinate axis 0 degrees is substantially the same as the intensity of the light in the range of 0 to 15 degrees on both sides of the coordinate axis of the coordinates of the light distribution curve C1 shown in the second figure. The light source module avoiding the long path length has a problem of insufficient brightness near the rear end surface 340, and is suitable for application to the large-sized light guiding body 31.

The light distribution curve C7 shown in the tenth figure is a light distribution curve performed by the groove corresponding to the angle of 150 degrees. By comparing the second and tenth figures, it can be seen that the light distribution curve C7 of the light entering the light guiding body 31 of the groove 322 having the angle θ of 150 degrees is substantially the same as the light distribution area line C1 shown in the second figure. The effect of destroying the light type is not obvious.

As can be seen from the foregoing, the groove 322 having an included angle θ of between 60 degrees and 120 degrees can effectively reduce the light transmitted to the rear end surface 340, thereby achieving an improvement in light utilization efficiency of the light source module 50.

Referring to FIG. 11 , the side of the light guiding element of the second embodiment of the present disclosure is view. The light guiding element 30A shown in the eleventh diagram is similar to the light guiding element 30 of the first embodiment, and the same elements are denoted by the same reference numerals. It should be noted that the difference between the two is that the groove 322A is composed of a first surface 324A and a second surface 326A, which is formed by a side cross-sectional view of the light guiding element 30A shown in FIG. 324A is adjacent to the light incident surface 320 and is substantially perpendicular to the light incident surface 320. The second surface 326A is designed to be planar. The second surface 326A has an angle obliquely adjacent to the light incident surface 320 and the first surface 324A.

Therefore, the direction in which the light entering the light guiding body 31A through the first surface 324A and the second surface 326A is different from the direction in which the light entering the light guiding body 31A through the light incident surface 320 is transmitted, thereby reducing the direct transmission of light to the opposite side. After the light incident surface 320 of the light incident surface 320, most of the light entering the light guiding body 31A can be emitted through a light emitting surface 342 adjacent to the light incident surface 320 and the rear end surface 340, thereby enabling the light source module having the light guiding element 30A. The luminous efficiency is improved. The functions and related descriptions of the respective elements of the light guiding element 30A are substantially the same as those of the light guiding element 30 of the first embodiment, and will not be described herein. The light guiding element 30A can at least achieve the same function as the light guiding element 30.

Referring to Fig. 12, there is shown a side view of a light guiding element according to a third embodiment of the present invention. The light guiding element 30B shown in Fig. 12 is similar to the light guiding element 30 of the first embodiment, and the same elements are denoted by the same reference numerals. It should be noted that the difference between the two is that the groove 322B is composed of a first surface 324B and a second surface 326B, as viewed from a side cross-section of the light guiding element 30B shown in FIG. 324B is adjacent to the light incident surface 320 and is substantially perpendicular to the light incident surface 320. The second surface 326B is adjacent to the light incident surface 320 and the first surface 324B in an arc shape.

Therefore, the direction in which the light entering the light guiding body 31B through the first surface 324B and the second surface 326B is different from the light entering the light guiding body 31B through the light incident surface 320. The direction of the light is directly transmitted to the end surface 340 opposite to the light incident surface 320, so that most of the light entering the light guiding body 31B can be emitted through a light emitting surface 342 adjacent to the light incident surface 320 and the rear end surface 340. Further, the light-emitting efficiency of the light source module having the light guiding element 30B is improved. The functions and related descriptions of the respective elements of the light guiding element 30B are substantially the same as those of the light guiding element 30 of the first embodiment, and will not be described herein. The light guiding element 30B can at least achieve the same function as the light guiding element 30.

Referring to Fig. 13, a side view of a light guiding element according to a fourth embodiment of the present invention is shown. The light guiding element 30C shown in the thirteenth embodiment is similar to the light guiding element 30 of the first embodiment, and the same elements are denoted by the same reference numerals. It should be noted that the difference between the two is that the groove 322C is composed of a first surface 324C and a second surface 324C, which is composed of a first surface 324C. Adjacent to the light incident surface 320, the second surface 326C is adjacent to the light incident surface 320 and the first surface 324C; the first surface 324C and the second surface 326C are arcuate surfaces respectively, and the first surface and the second surface are adjacent to each other. The curvature is continuously distributed.

Therefore, the transmission direction of the light entering the light guiding body 31C through the first surface 324C and the second surface 326C is different from the transmission direction of the light entering the light guiding body 31C through the light incident surface 320, thereby reducing the direct transmission of the light to the opposite side. After the light incident surface 320 of the light incident surface 320, most of the light entering the light guiding body 31C can be emitted through a light emitting surface 342 adjacent to the light incident surface 320 and the rear end surface 340, thereby enabling the light source module having the light guiding element 30C. The luminous efficiency is improved. The functions and related descriptions of the respective elements of the light guiding element 30C are substantially the same as those of the light guiding element 30 of the first embodiment, and will not be described herein. The light guiding element 30C can at least achieve the same function as the light guiding element 30.

Referring to FIG. 14, a perspective view of a light guiding element according to a fifth embodiment of the present disclosure is provided. Light guiding element 30D shown in FIG. 14 and light guiding element of the first embodiment 30 is similar, and the same elements are denoted by the same symbols. It is to be noted that the difference between the two is that a groove 322D composed of a plurality of notches 3220D is formed on the light incident portion 32D of the light guiding element 30D shown in FIG.

Each of the scores 3220D extends along a first direction D1, and the scores 3220D are arranged at equal intervals along the second direction D2. Each of the scores 3220D can be used to change the incident light transmission direction, thereby reducing the amount of light that is transmitted to the light guide body 31D and transmitted to the rear end surface 340, thereby achieving an improvement in the optical interest rate efficiency. The function and related description of each element of the light guiding element 30D are substantially the same as those of the light guiding element 30 of the first embodiment, and will not be described herein. The light guiding element 30D can at least achieve the same function as the light guiding element 30.

Referring to the fifteenth figure, a perspective view of a light guiding element according to a sixth embodiment of the present disclosure is shown. The light guiding element 30E shown in the fifteenth figure is similar to the light guiding element 30 of the first embodiment, and the same elements are denoted by the same reference numerals. It is to be noted that the difference between the two is that a recess 322E composed of a plurality of recesses 3220E is formed in the light incident portion 32E of the light guiding element 30E shown in FIG. These pockets 3220E are arranged at equal intervals along the first direction D1.

Each of the recesses 3220E is adapted to change the incident light transmission direction, thereby reducing the light entering the light guiding body 31E to be transmitted to the rear end surface 340, thereby achieving an improvement in optical interest rate efficiency. The functions and related descriptions of the respective elements of the light guiding element 30E are substantially the same as those of the light guiding element 30 of the first embodiment, and will not be described herein. The light guiding element 30E can at least achieve the same function as the light guiding element 30.

Referring to FIG. 16, a perspective view of a light guiding element according to a seventh embodiment of the present invention is shown. The light guiding element 30F shown in Fig. 16 is similar to the light guiding element 30 of the first embodiment, and the same elements are denoted by the same reference numerals. It is worth noting that the difference between the two The difference is that the light incident portion 32F of the light guiding member 30 shown in FIG. 16 is formed with a recess 322F composed of a plurality of notches 3220F and a plurality of recesses 3222F. The recesses 3222F are arranged at equal intervals along the first direction D1, and the recesses 3222F are located between the adjacent two scores 3220F, and the recesses 3222F are equally spaced from the adjacent two scores 3220F.

The scores 3220F and the recesses 3222F are used to change the incident light transmission direction, thereby reducing the amount of light transmitted to the light guide body 31F to the rear end surface 340, thereby achieving an increase in optical interest rate efficiency. The function and related description of each element of the light guiding element 30F are substantially the same as those of the light guiding element 30 of the first embodiment, and will not be described herein. The light guiding element 30F can at least achieve the same function as the light guiding element 30.

Referring to Figure 17, a side view of the light source module of the experimental example is taught in reverse. For the rigor of the present invention, the convex portion 2200 which is opposite to the groove is configured as follows: the light source module 20 includes a light guide plate 22 and a light-emitting element 24, and the light guide plate includes a light-incident surface 220, a light-emitting surface 222, and a light-emitting surface. A bottom surface 224 and a rear end surface 226. The light-emitting surface 222 is adjacent to the light-incident surface 220. The bottom surface 224 is opposite to the light-emitting surface 222 and adjacent to the light-incident surface 220. The rear end surface 226 is opposite to the light-incident surface 220 and adjacent to the light-emitting surface 222 and the bottom surface 224. The light exit surface 222 and/or the bottom surface 224 are provided with a plurality of microstructures 228 for varying the path of travel of the light transmitted thereto.

The light incident surface 220 has a convex portion 2200 protruding in a direction opposite to the rear end surface 226. The light emitting element 24 is disposed in front of the convex portion 2200 and emits light toward the light incident surface 220. The light distribution curve C8 of the light source module 20 corresponding to the viewing angle shown in FIG. 17 is as shown in FIG.

It can be known by comparing the light distribution curve C1 of the second figure with the light distribution curve C8 of the eighteenth figure. The convex portion 2200 formed on the light incident surface 220 causes the amount of light that is projected to the end surface 226 of the light guide plate 22 to be increased. As a result, the amount of light emitted from the light exit surface 222 is further reduced, thereby causing light utilization of the light source module 20. Reduced efficiency.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect.

30‧‧‧Light guiding elements

31‧‧‧Lighting body

32‧‧‧Into the Department of Light

320‧‧‧Into the glossy side

322‧‧‧ Groove

33‧‧‧ bottom

330‧‧‧Bottom

344‧‧‧ side

D1‧‧‧ first direction

D2‧‧‧ second direction

D3‧‧‧ third direction

Claims (9)

A light guiding component is configured to cooperate with at least one light emitting component to form a light source module, the light emitting component has a light emitting region, and the light guiding component comprises: a light guiding body having a bottom surface; and a light entering portion located at the light guiding The body has a light incident surface, the light incident surface is adjacent to the bottom surface, and the light incident surface and the bottom surface cooperate to define a bottom edge, the light guiding body defines a first direction parallel to the bottom edge; and a concave surface a groove extending in the first light direction, the groove extending along a first direction perpendicular to the first direction, and a length of the light emitting region in the second direction /10 to 1/3. The light guiding element of claim 1, wherein the groove has an included angle of 60 to 120 degrees. The light guiding element of claim 1, wherein the groove and the light guiding body cooperate to define a first surface and a second surface, the first surface is adjacent to the light incident surface, and the second surface is adjacent to the light emitting surface The light entrance surface and the first surface. The light guiding element of claim 3, wherein the first surface and the second surface are respectively planar, the first surface having an angle obliquely adjacent to the light incident surface, the second surface having an angle obliquely connected to The light incident surface and the first surface. The light guiding element of claim 3, wherein the first surface is substantially perpendicular to the light incident surface, and the second surface has an angle obliquely adjacent to the light incident surface and the first surface. The light guiding element of claim 3, wherein the first surface is substantially perpendicular to the light incident surface, and the second surface is arcuately adjacent to the light incident surface and the first surface. The light guiding element of claim 1, wherein the groove is composed of a plurality of pockets arranged at intervals along the first direction. The light guiding element according to claim 1, wherein the groove is composed of two or more notches spaced along the second direction and extending in parallel in the first direction. The light guiding element of claim 1, wherein the groove is formed by a plurality of pockets arranged at intervals along the first direction, and two or more spaced along the second direction, and the first The scoring consists of parallel extending directions.